Through compiling and analyzing the paleoclimatic and tectonic records from East Asia since 15Ma, the results suggest the East Asian Winter Monsoon gradually strengthened consisting with global cooling. Asian Summer Monsoon progressively weakened from lOMa and strengthen again since 4Ma. We speculated there was a water passage between eastern margin of the Tibetan Plateau and western Qinling Mountain during the period of 1 1.16Ma to 7.00Ma. The Asian Summer Monsoon precipitation could travel a long distance to the northeastern margin of the Tibetan Plateau through the passage. Subsequently, the water passage entirely closed after 8 ~ 7Ma resulted from the sustained eastward expansion of the Tibetan Plateau during the Late Miocene. In addition, global cooling and weakening summer monsoon promoted the dry climate in Northwest China and widespread aeolian dust accumulation. In the glacial-interglacial cycles, Asian Summer Monsoon led East Asian Winter Monsoon by 30ka in phase relationship since 2.75Ma. This could suggest that the East Asian Winter Monsoon was dominated by the Northern Hemisphere ice volume, while the Asian Summer Monsoon was forced by the combined effects of the Northern Hemisphere ice volume and low latitude processes.